Rail car cover system

ABSTRACT

A rail car cover system that includes a rail car, a first cover section and a second cover section. The rail car has an opening. The first cover section is operably attached to the rail car. The first cover section includes a first closure mechanism. The second cover section is operably attached to the rail car. The second cover section includes a second closure mechanism. The first cover section and the second cover section are both movable between a closed configuration and an open configuration. When in the closed configuration, the first closure mechanism engages the second closure mechanism to maintain the first cover section and the second cover section in the closed configuration.

REFERENCE TO RELATED APPLICATION

This application claims priority to U.S. Provisional Application No. 61/318,658, which was filed on Mar. 29, 2010, the contents of which are incorporated herein by reference.

FIELD OF THE INVENTION

The invention relates generally to enclosures for vehicles. More particularly, the invention relates to enclosures for rail cars.

BACKGROUND OF THE INVENTION

When transporting relatively large quantities of many types of products, it is typically more cost effective to transport the products in bulk where the products are placed into the vehicle that is utilized to transport the product.

Depending on various factors such as the quantity of products being shipped and the distance over which the products are being shipped, the products may be transported in a rail car, a truck or a trailer. To facilitate placing the product into and/or out of the transport vehicle, the transport vehicle may include an open top.

When transporting various types of products in open top vehicles, it is possible for air movement over the product to cause a portion of the product to be blown out of the transport vehicle. Even when a relatively small portion of material is blown out of the transport vehicle, this lost material may pose problems.

For example, when coal is being hauled in open top rail cars, relatively small coal particles or dust may be blown out of the rail cars from the flow of air over the coal as the rail cars move as well as from ambient winds. Even though the amount of coal that is blown out of a particular rail car may be relatively small, the rail cars are typically moved in relatively long trains that may each have over 100 rail cars, which may cause a significant amount of coal dust to accumulate. In addition, in certain areas, many trains may travel through the same area numerous times each day, which could result in significant accumulation of the material blown out of the rail car over extended periods of time.

When the coal particles accumulate proximate to the railroad tracks over which the trains pass, the quality of the rail bed may be degraded. For example, the ability of the rail bed to properly drain water from rain or melting snow is diminished which can lead to the saturation of the rail bed and subsoil beneath the tracks. This could lead to potentially dangerous situations such as derailment of rail cars.

There have been various attempts to reduce coal particles escaping from the rail cars and contaminating the roadbed and the surrounding environment. Unfortunately, there are numerous barriers that exclude the use of a tarp or previously known mechanical closures. One example is that sometimes coal is loaded and unloaded from rail cars while they are moving. Another example is that some rail cars are completely inverted during the unloading process and prior cover designs interfere with the clamps or dumping process.

One dust controlling technique involves spraying water on top of the coal. While water initially works well, water tends to evaporate relatively fast because of the air flow over the coal pile as the rail car moves. Additionally, water tends to be in relatively short supply in some areas where coal is mined.

Another technique involves spraying water soluble chemicals over the coal to create a wind resistant crust. While these materials can last much longer than water, they are considerably more expensive than water and must be mixed with water, which can be in relatively short supply in some regions where coal is mined as noted above.

During transit, coal tends to shift which can decrease the effectiveness of the wind resistant crust. There are also potential issues relating to the water soluble materials being compatible with the power plants in which the coal is burned.

It has also been proposed to place a rigid cover over the rail car. Prior to the coal loading or unloading process, the rail car rigid cover is lifted off of the rail car. Once the loading or unloading process is completed, the rail car rigid cover is replaced onto the rail car.

Because of the relatively large size of the rail car rigid cover, there are challenges associated with handling the rail car rigid cover during the coal loading process at the mine and the unloading process at the power plants. Because of the fact that the rail car rigid cover handling equipment may be relatively large and the process cumbersome or in the case of bottom dump unloading it may be possible that the rail car rigid cover can remain in the closed position on the rail car during the dumping process if it has adequate venting capabilities.

SUMMARY OF THE INVENTION

An embodiment of the invention is directed to a rail car cover system that remains with the rail car and is movable between a closed position and an open position. When the rail car cover system is in the closed position, objects previously placed in the rail car are precluded from blowing out of the rail car. The elements such as rain or snow are also precluded from entering the rail car. When in the open position, objects may be placed into or removed from the rail car.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings are included to provide a further understanding of embodiments and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments and together with the description serve to explain principles of embodiments. Other embodiments and many of the intended advantages of embodiments will be readily appreciated as they become better understood by reference to the following detailed description. The elements of the drawings are not necessarily to scale relative to each other. Like reference numerals designate corresponding similar parts.

FIG. 1 is a perspective view of a rail car cover system according to an embodiment of the invention where the rail car cover system is in a closed configuration.

FIG. 2 is a side view of the rail car cover system in the closed configuration.

FIG. 3 is an end view of the rail car cover system in the closed configuration.

FIG. 4 is a perspective view of a corner hinge assembly for the rail car cover system.

FIG. 5 is a perspective view of an intermediate hinge assembly for the rail car cover system.

FIG. 6 is a side view of a hinge mechanism for the intermediate hinge assembly.

FIG. 7 is a top view of the hinge assembly of FIG. 5.

FIG. 8 is an outer view of an anti-flutter strap.

FIG. 9 is an inner view of the anti-flutter strap.

FIG. 10 is a perspective view of a closing sensor.

FIG. 11 is a top view of a magnet closure mechanism.

FIG. 12 is an end view of the rail car cover system in a closed configuration.

FIG. 13 is an end view of the rail car cover system in a first opening configuration.

FIG. 14 is an enlarged close-up view of a magnet closure mechanism on the rail car cover system.

FIG. 15 is an end view of the rail car cover system in a second opening position.

FIG. 16 is an end view of the rail car cover system in a third opening position.

FIG. 17 is an end view of the rail car cover system in a closed position over a load.

FIG. 18 is an end view of the rail car cover system.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

An embodiment of the invention is directed to a rail car cover system for an open top vehicle such as a rail car, as illustrated at 10 in the figures. The rail car cover system 10 substantially covers an upper end 20 of a rail car 22 when in the closed configuration.

The rail car cover system 10 may include three main components—a cover, an opening system and a control system. Each of these components work together to cause the rail car cover system 10 to move between the closed position and the open position.

The rail car 22 does not illustrate wheel assemblies because a variety of types of wheel assemblies such as are suited for use on rails or conventional roads may be used in conjunction with the rail car cover system 10 of the current invention.

One advantage of the rail car cover system 10 is that the rail car cover system 10 provides near complete coal dust mitigation in a highly reliable manner. While the concepts of the invention are particularly suited for use in conjunction with rail cars 22 that carry coal, a person of skill in the art will appreciate that other materials may be transported in the rail car 22. An example of one such alternative material is grain, which is more susceptible to being blown out of an uncovered top on the rail car as well as being susceptible to damage caused by precipitation. The rail car cover system 10 can be adapted for use in conjunction with rail cars 22 having a variety of heights, lengths and widths.

Another advantage of the rail car cover system 10 is that it enhances the aerodynamics of the rail car 22, which may be more important when the rail car 22 is moving empty. Using the rail car cover system 10 in conjunction with the rail car 22 could thereby enhance the fuel efficiency of the train. In certain embodiments, the increase in the fuel efficiency of the train may be up to about 20 percent.

Yet another advantage of the rail car cover system 10 is that it reduces the potential of precipitation entering the rail car 22 and thereby affecting the ability to unload the coal from the rail car 22. For example, water that enters the coal pile and then freezes because of low ambient temperatures could cause the coal pile to solidify. When this occurs the rail car 22 would need to be heated before it is possible to unload the coal from the rail car 22.

In certain embodiments, the rail car cover system 10 includes a first cover section 24 and a second cover section 26. The first cover section 24 and the second cover section 26 are operably attached to opposite sides of the rail car 22. In certain embodiments, the first cover section 24 and the second cover section 26 may have a substantially identical configuration.

In other embodiments, the rail car cover system 10 may include a single cover section or different sizes. It is also possible to fabricate the rail car cover system 10 having a length and a width that is less than the length and/or width of the rail car 22 to which it is attached.

The first cover section 24 and the second cover section 26 may each have at least one corner hinge assembly 30, such as illustrated in FIG. 4. While the corner hinge assembly 30 may be substantially flat, forming the corner hinge assembly 30 with other configurations such as a U-shape cross-section may enhance the strength of the corner hinge assembly 30. However, the corner hinge assembly 30 should be relatively flat to allow the rail car 22 to slide into a relatively small clearance between the rail car 22 and a spill girder of a rotary dumper (not shown).

The corner hinge assembly 30 may have a substantially linear configuration so that the corner hinge assembly may be substantially adjacent to an upper surface on the end of the rail car 22 in the closed position. This configuration restricts air from flowing under the cover system 10 when the rail car 22 is moving.

The corner hinge assembly 30 may be substantially adjacent to the outer surface of the side of the rail car 22 in the open position. This configuration allows either cover section 24, 26 to slide into a relatively small clearance between the spill girder and the side of the rail car 22 as the rail car 22 enters a barrel of the rotary dumping mechanism. The corner hinge assembly 30 may be fabricated from a rigid material such as steel that resists deformation and bending.

In certain embodiments, the corner hinge assembly 30 may be operably attached to a side of the rail car 22 proximate an upper edge thereof using a hinge mechanism 36. As is described in more detail below, the hinge mechanism 36 may enable the corner hinge assembly 30 to pivot over a range of more than 180° and, in certain embodiments, up to about 270° such that the corner hinge assembly 30 may be in a generally horizontal position for covering the rail car 22 as well as in a generally vertical position where the corner hinge assembly 30 is adjacent to a side of the rail car 22 to facilitate loading and/or unloading of the rail car 22.

In certain embodiments, the corner hinge assembly 30 may have a width that is greater proximate a proximal end 32 than proximate a distal end 34. Forming the corner hinge assembly 30 with this shape may compensate for the greater forces that are placed on the corner hinge assembly 30 proximate the proximal end 32.

The geometry of the corner hinge assembly 30 may be such that its axis is skewed. This configuration allows the end arms to be plumb and perpendicular in the open position, which ensures that the cover 10 will be flat and flush against the outside of the rail car. As the corner hinge assemblies 30 rotate to the closed position, the corner hinge assemblies 30 will angle in slightly allowing the taut cover to follow the contours of the coal pile down the center of the rail car 22 while remaining straight along the hinge line.

The corner hinge assembly 30 may include an offset lower end that facilitates attachment of the corner hinge assembly 30 to the rivet line on the rail car 22. Attachment at the rivet line may be required by the owner and/or manufacturer of the rail car 22 to avoid voiding the warranty on the rail car 22.

While it is possible to connect the hinges 36 together that extend along the length of the rail car 22, an advantage of not connecting the hinges is that the different hinges may pivot at different rates such as in response to a force being placed on one of the hinge assemblies. Using separate hinges 36 also allows for more axial misalignment on rail cars that may not be straight. Separate hinges 36 allow for different amounts of linear axial movement of the cover due to tensioning and thermal expansion.

At least one intermediate hinge assembly 36 may also be provided, as illustrated in FIG. 5. In certain embodiments, 2-10 intermediate hinge assemblies 36 are utilized on each side of the first cover section 24 and the second cover section 26. In other embodiments, there are about 6 intermediate hinge assemblies 36. Using this quantity of hinges provides the first and second cover sections 24, 26 with support while reducing the instances of flutter.

An angled gusset 38 may be provided on each of the intermediate hinge assemblies 36. In certain embodiments, each of the intermediate hinge assemblies 36 includes two angled gussets 38.

The angled gusset 38 may include an upper gusset surface 39 that is oriented at a non-horizontal angle. The angled gusset 38 may limit the distance to which the intermediate hinge assemblies 36 may pivot when moving to the closed configuration.

The angle of the upper gusset surface 39 may be different at different locations on the rail car 22. The angle may be between 0 and 40 degrees. For example, the angle may gradually increase when moving from the end of the rail car 22 to the center of the rail car 22. This configuration allows the rail car cover system 10 to be more elevated proximate a center of the rail car 22 to accommodate a greater height of the coal pile proximate the center of the rail car 22.

The hinge ribs 40 in between the corner hinge assemblies have two functions. The hinge ribs 40 support fiberglass ribs that sandwich and support the cover. The hinge ribs 40 also allow the whole assembly to rotate with the arms when the rotary actuator is moved between open and closed positions.

These intermediate hinges 36 hold the fiberglass at a slightly higher angle when in the closed position. A first hinge rib from each corner is a transitional hinge 40. The transitional hinge 40 holds the fiberglass at a lower angle in the closed position. This configuration allows the cover to smoothly transition from the arched shape in the middle of the rail car 22 to a flat profile at the end arms. The transitional hinges 40 may have shorter and stiffer fiberglass ribs that allow for less curvature of the cover to thereby transition to the relatively flat end arms.

The intermediate hinges 36 may be formed with different structures on each side of the rail car cover system 10. For example, the ribs on the first cover section 24 that includes the plates 92 may be formed from a thicker material that the ribs on the second cover section 26 that includes the magnets 94. In certain embodiments the ribs on the first cover section 24 have a thickness of about 5/16 of an inch while the ribs on the second cover section 26 have a thickness of about 3/16 of an inch.

Forming the ribs with this configuration enables the first cover section 24 to be more rigid while the second cover section 26 is less rigid. The first cover section 24 is thereby maintained at an elevated position. When the second cover section 26 is lowered, the less rigid ribs enable the second cover section 26 to bend downward in response to the magnetic attraction between the magnets 90 and the plates 92.

The ribs placed on the upper side of the first and second cover sections 24, 26 may be more rigid than the lower ribs. In certain embodiments, the upper ribs have a thickness of about 7/16 of an inch. Since the upper ribs only extend a portion of the length of the lower ribs, the upper ribs enhance the strength of the first and second cover sections 24, 26 while allowing an outer portion of the first and second cover sections 24, 26 to deflect in response to the magnetic attraction.

The fiberglass ribs flexing to convex slope is done to better fit the shape of the coal pile and to provide a smooth transition from one cover side to the other as it arcs over the rail car and to shed precipitation. The convex shape also gives the cover material some structural integrity that allows the cover material to span between adjacent ribs while minimizing sagging.

It is possible for the transitional and intermediate hinge assembly 36, 40 to have a substantially linear configuration or a convex configuration. In addition to increasing the volume of product that may be transported in the rail car, forming the intermediate hinge assembly 36 with a convex configuration may also increase the strength of the intermediate hinge assembly 36.

In certain embodiments, the intermediate hinge assembly 36 is fabricated from a flexible material such as fiberglass 42 that is substantially straight when the cover system 10 is in the open position and is curved to a convex configuration when the cover system 10 is in the closed position.

While it is illustrated that the corner hinge assembly 30 and the intermediate hinge assembly 36 have different shapes, it is possible for the corner hinge assembly 30 and the intermediate hinge assembly 36 to have similar shapes. In certain embodiments, the intermediate and transitional hinge assemblies 36, 40 may have a substantially planar cross section or other shaped profiles.

In certain embodiments, the intermediate hinge assembly 36 may be formed from more than one elongated member 42 that is operably attached together at one or more locations. Additionally, in certain embodiments, the intermediate hinge assembly 36 may have a width that is greater proximate a proximal end 44 than proximate a distal end 46.

In certain embodiments, the intermediate hinge assembly 36 may be operably attached to a side of the rail car 22 proximate an upper edge thereof using a hinge mechanism 48. As is described in more detail below, the hinge mechanism 48 may enable the intermediate hinge assembly 36 to pivot over a range of more than 180° and, in certain embodiments, up to about 270° such that the intermediate hinge assembly 36 may be in a generally horizontal position for covering the rail car 22 as well as in a generally vertical position where the intermediate hinge assembly 36 is adjacent to a side of the rail car 22 to facilitate loading and/or unloading of the rail car 22.

The hinge mechanism 48 may include an offset lower end, as illustrated in FIGS. 6 and 7, which facilitates attachment of the intermediate hinge assembly 36 to the rivet line on the rail car 22. Attachment at the rivet line may be required by the owner and/or manufacturer of the rail car 22 to avoid potentially weakening the rail car 22 by forming holes in the rail car 22 when attaching the rail car cover system 10 to the rail car 22. Such additional holes are also undesirable because they affect the warranty on the rail car 22.

In certain embodiments, the cover system 10 may include an upper frame member (not shown) that extends substantially along a length of the cover system 10 between the corner hinge assembly 30 and the intermediate hinge assembly 36 or between the intermediate hinge assemblies 36 opposite to where the cover system 10 attaches to the rail car 22.

The corner hinge assembly 30 and the intermediate hinge assembly 36 may be substantially covered by a flexible material 60 such as a tarp or belting. In certain embodiments, the flexible material 60 may be waterproof. Covering the corner hinge assembly 30 and the intermediate hinge assembly 36 with the flexible material 60 enables the cover system 10 to bend such as when coal extends above an upper edge of the rail car 22. Additionally, the flexible material 60 and the intermediate hinge assemblies 36 can deflect in response to the low pressures caused as the coal is discharged from the bottom of the rail car 22.

The flexible material 60 should possess a high degree of strength and resist damage caused by objects contacting the flexible cover 60. In certain embodiments, the flexible material 60 may have a configuration that is similar to the material used for fabricating conveyor belts or swather belts.

A sleeve may be provided in the flexible material 60 proximate to where the intermediate hinge assembly 36 is attached to the flexible material 60. Such a configuration enables the flexible material 60 to slide with respect to the intermediate hinge assembly 36.

Movement of the first cover section 24 and the second cover section 26 between the open and closed configurations may be accomplished using a mechanical assist such as a hydraulic actuator 70. Depending on the size of the rail car cover system 10, it is also possible to manually move the first cover section 24 and the second cover section 26 between the open and closed configurations. Another method is to use the train movement to cause the first cover section 24 and the second cover section 26 to move between the open and closed configurations.

At least one of the hydraulic actuators 70 may be placed along each side of the rail car. In certain embodiments, one of the hydraulic actuators is mounted proximate each of the corners of the rail car 22. In certain embodiments, one of the hydraulic actuators 70 is an integral part of the corner hinge assembly 30 while in other embodiments, the hydraulic actuator 70 is placed adjacent to each of the corner hinge assemblies 30.

The hydraulic actuator 70 is selected with a sufficient capacity to move the first cover section 24 and the second cover section 26 between the open and closed positions. The hydraulic actuator 70 may also be mounted inside of the rail car 22. A mounting bracket is used to attach the hydraulic actuator 70 to the rail car 22.

In certain embodiments, the operation of the rail car cover system 10 is controlled with a hydraulic pump 104 that is operably connected to the hydraulic actuator 70. Through the use of hydraulic actuators 70 to control the operation of the rail car cover system 10, the rail car cover system 10 operates in a highly reliable manner independent of external factors such as the ambient temperature and the presence of precipitation. The hydraulic pump 104 may be reversible for opening and closing of the cover system 10. Alternatively, a directional valve may be utilized in conjunction with a single direction hydraulic pump 104.

A single hydraulic pump 104 may be utilized to simultaneously power the operation of all of the hydraulic actuators 70 on the cover system 10. Alternatively, it is possible to independently operate each of the hydraulic actuators 70.

Through the use of counterbalance valves on the hydraulic actuators 70 to control the operation of the rail car cover system 10, the rail car cover system 10 is locked in a stationary position when the hydraulic pump 104 stops. The counterbalance valves also provide smooth stable motion when dealing with an over-center load. For example, this configuration retains the rail car cover system 10 in the open position when loading and unloading the rail car 22 and in the closed position when the rail car 22 is moving when loaded.

This system thereby reduces the potential of damage to the components of the rail car cover system 10 caused by the rail car cover system 10 inadvertently moving from either the open position or the closed position. The counterbalance valve may be mounted adjacent to the hydraulic actuator 70 so that if one of the hydraulic lines experiences a failure, the counterbalance valve would cause the hydraulic actuators 70 to remain in a fixed position.

Instead of using a hydraulic system to operate the first and second cover sections 24, 26, it is possible to use other power sources to operate the first and second cover sections 24, 26. An example of one such suitable alternative power source is an electric linear actuator. The electric linear actuator may be configured to be positioned in a location that is similar to the hydraulic system components.

The electric linear actuator should be selected to provide the torque necessary to operate the first and second cover sections 24, 26 even when the first and second cover sections 24, 26 are subjected to external forces such as wind. A potential advantage of selecting the electric linear actuator is that it may be possible to more accurately track the location of the first and second cover sections 24, 26 using the electric linear actuator than using the hydraulic system.

In certain embodiments, the hydraulic pump 104 could receive power from a pair of electric contact paddles 80 mounted on the rail car 22 that interact with an additional pair of power rails 82 that are provided adjacent to the railroad tracks over which the rail car 22 moves, as illustrated in FIG. 3. This system may be similar to the system that is used to control the opening and closing of gates on bottom dump rail cars.

The electric contact paddles 80 may be retractable and spring loaded to not only prevent damage to the contact paddles 80 but also to ensure good electrical contact between the contact paddles 80 and the power rails 82 that are utilized to power the operation of the hydraulic actuator 70.

In certain embodiments, the contact paddles 80 are provided on one side of the rail car 22. In other embodiments, the contact paddles 80 are mounted on both sides of the rail car 22. This later configuration enables the rail car cover system 10 to be operated irrespective of the direction in which the rail car 22 is traveling. In other embodiments, the power rails may be mounted along side of, above or below the rail car.

The power rails 82 are connected to positive and negative terminals of a DC power supply. The polarity of the power rails 82 will determine if the covers 10 are opening or closing. The length of the power rails 82 is determined by how fast the train is moving and how long the hydraulic pump needs to run to open and close the first and second cover sections 24, 26. Since the train speed may vary slightly when loading the rail cars 22, the power rails 82 need to be long enough to accommodate the fastest speed at which the train will move.

The contact paddles 80 may be mounted on the rail car 22 so that they will come into sliding contact with a pair of stationary power rails 82 as the rail car moves on the track. The interface between the rail car 22 and the loading/unloading facility is dimensionally stable and has low forces involved. This configuration is thereby reliable to operate in a variety of conditions over long periods of time.

In certain embodiments, the operation of the first and second cover sections 24, 26 can be controlled with an on-board power source. The on-board power source enables the rail car cover system to be operated without physical improvements to the area in which the rail car cover system will be operated. One suitable on-board power source at least one battery 100. The batteries 100 may be mounted on each of the rail cars 22 to enable the rail cars 22 to operate independently such that if something goes wrong with a component on one of the rail cars 22, that rail car 22 can be disconnected from the remaining rail cars.

The batteries 100 should be selected to provide the components of the rail car cover system with sufficient power. In certain embodiments, the batteries are 12 volt batteries and 2 batteries are provided. While only one of the batteries 100 may be used to operate the control system, both batteries 100 may be utilized to provide 24 volts for operating the hydraulic pump 104.

While it is possible to use non-rechargeable batteries that are replaced when depleted, using rechargeable batteries may not only reduce operation cost but also reduce the time associated with replacing the batteries.

In certain embodiments, an on-board charging system is provided to periodically recharge the batteries. An example of one suitable on-board charging system utilizes at least one solar panel 106. A person of skill in the art will appreciate that the size of the solar panels 106 depend the energy needed to operate the rail car cover system 10.

The solar panel 106 may be mounted in a variety of locations on the rail car 10. However, there may be restrictions on such permissible mounting locations. For example, mounting the solar panel 106 on the side of the rail car 22 may cause the rail car 22 to have a width that is too great. In certain embodiments the solar panel 106 is mounted proximate to an end of the rail car, as illustrated in FIG. 18.

The solar panel 106 may be mounted offset from a center of the rail car 22 on the end of the rail car 22. Mounting the solar panel 106 in this manner reduces the potential that if two rail cars 22 are oriented with the solar panel 106 ends facing each other that the solar panels 106 will not contact each other either when the train is moving straight or when the train is moving along curved tracks.

The mounting position of the solar panel 106 on the rail car should also facilitate solar rays impinging upon the solar panel 106 for the largest amount of time. One such location that enhances the solar rays impinging on the solar panel 106 is mounting the solar panel 106 proximate an upper edge of the rail car 22.

Mounting the solar panel proximate an upper edge of the rail car 22 also reduces the potential that the solar panel 106 could be intentional or unintentionally damage or removed by persons. In spite of these benefits, the solar panel 106 may be mounted using a technique that reduces the potential of the solar panel 106 being detached using conventional tools such as screw drivers or wrenches.

Another example of an on-board power system that may be used in conjunction with the rail car cover system 10 is a generator. The generator may engage one of the rails over which the rail car 22 rolls. It is also possible for the generator to engage one of the wheel assemblies on the rail car 22.

Yet another on-board power source that may be used to operate the rail car cover system 10 is obtained from the locomotive that is pulling the rail car 22. For example, compressed air may be used to control movement of the first and second cover section 24, 26. It is also possible for electricity to be provided by the locomotive.

As the rail cars 22 enter the loading/unloading facility, the rail cars 22 will initially go by first pair of power rails 82 that will run the hydraulic pump in a first direction to open the first and second cover sections 24, 26, as illustrated in FIGS. 6-13. Thereafter, the rail cars 22 will go by a second pair of power rails 82 with an opposite polarity that will run the hydraulic pump in an opposite direction to close the first and second cover sections 24, 26.

Other techniques for activating the cover system include GPS activation, proximity switches and laser beams. Another technique for controlling the operation of the rail car cover system 10 is using a wireless controller. A person of skill in the art will appreciate that a variety of protocols may be used for wireless communication between the control system and an associated wireless controller.

This situation may cause the hydraulic pump to operate longer than is needed to open or close the first and second cover sections 24, 26. A kick down relief valve may be provided that permits the hydraulic pumps to operate at a much lower pressure when tripped when the first and second cover sections 24, 26 reach the open or closed positions.

The pressure relief valve may have a pressure setting that is usually substantially higher than the highest pressure required by the circuit. All of the components in the circuit should have a pressure rating higher than the relief setting.

Due to the relatively small volume of oil flow in this system, the hydraulic system can safely run over a tripped relief for many minutes to accommodate the range of speed for a particular train. However, if the train were to stop for an extended period of time during the open/close cycle, the operator would need to de-energize the powered rails, which will result in turning off the hydraulic pump.

To further reduce the potential of the rail car cover system 10 inadvertently opening while in a closed configuration, a sealing mechanism may be provided along at least a portion of the center of the rail car 22 where the first and second cover sections 24, 26 abut each other. One such suitable sealing mechanism encompasses at least one magnet 90 mounted to at least one of the first and second cover sections 24, 26.

One such suitable magnet 90 that may be used in conjunction with the rail car cover system 10 is a permanent magnet. An advantage of using the permanent magnet is that an external power source is not needed to retain the magnet 90 in an attraction mode. However, since there may be an on-board power source that is used in conjunction with the rail car cover system 10, it may be possible to use this on-board power source in conjunction with electromagnets.

In certain embodiments, the permanent magnet is a rare earth magnet, which provides a high degree of magnetic attraction. One particularly suitable rare earth magnet that may be used in conjunction with the rail car cover system 10 is a neodymium magnet.

These magnets 90 should also resist loss of magnetic strength when subjected to elevated temperatures such as may be encountered if the rail car has to undergo thawing. The incorporation of this feature in the neodymium may require additional processing of the magnets. The neodymium magnets have a Curie point of greater than 400° F., which is greater than the temperatures used in conventional equipment for thawing railroad cars.

In certain embodiments, the magnets 90 may be mounted in a spaced-apart configuration on one of the first and second cover sections 24, 26. Since the ends of the first and second cover sections 24, 26 are held down with the hydraulic actuator, the spacing of the magnets 90 may be closest proximate a center of the first and second cover sections 24, 26. There may also be a section of the first and second cover sections 24, 26 that is proximate the ends thereof that does not have any magnets 90.

In one suitable configuration, one of the magnets 90 is placed proximate a center of the rail car 22. A distance between the center magnet 90 and the adjacent magnet 90 may be about 12 inches. A distance between subsequent adjacent magnets 90 may be progressively larger. For example, as moving toward the ends of the rail car 22, the distance between each set of magnets 90 may increase by one inch such that the spacing between adjacent pair of magnets 90 is 13 inches, 14 inches, etc as moving from a center of the rail car 22 towards an end of the rail car 22.

In certain embodiments, there are between about 10 and 30 magnets 90 mounted on the first cover section 24. In other embodiments, there are about 21 magnets 90 mounted on the first cover section 24. A person of skill in the art will appreciate that the number of magnets 90 utilized will depend on a variety of factors such as the strength of each of the magnets 90. It is also possible to provide the magnet in a strip that extends at least partially across a length of the rail car 22.

As the first and second cover sections 24, 26 may be fabricated from non-metallic material, a metallic plate may be attached to the second cover section 26 so that the plate 92 is adjacent to one of the magnets 90 when the first and second cover sections 24, 26 are in the closed configuration. The plate 92 may be formed with a thickness that is sufficiently large to provide a sufficient attraction between the plate 92 and the magnet 90 to retain the first and second cover sections 24, 26 in the closed configuration.

The plate 92 may be formed with a length and a width that are sufficiently large so that the magnet 90 is always over the plate 92 when the first and second cover sections 24, 26 are in the closed configuration. This configuration minimizes the potential of rubbing of the magnet 90 against the cover material 60 from damaging the cover material 60.

The plate length and width may be selected to ensure that the desired position is obtained when there is a load of product such as coal in the rail car 22 as well as when no product is in the rail car 22. In certain embodiments, the plate 92 is formed with a length that is at least twice the size of a length of the magnet 90.

At least one of the magnets 90 and the plates 92 may be at least partially recessed into the surface of the first and second cover sections 24, 26. Recessing the magnet 90 and the plate 92 into the surface of the first and second cover section 24, 26, respectively, reduces a thickness of the first and second cover sections 24, 26.

In certain embodiments, a hole may be formed in the first and second cover section 24, 26 that has a profile that conforms to a profile of the magnet 90 or the plate 92 that is intended to be mounted in that location.

As discussed above, it is desired for each of the end arm mechanisms 30 and each of the intermediate arm mechanisms 40 to independently operate. Because of this configuration, there may not be a rail that extends along a lower edge of each of the first and second cover sections 24, 26.

To reduce the potential of air blowing underneath the lower edge of the cover, at least one anti-flutter strap 50 may be attached between each of the intermediate arm mechanisms 40 as well as between the end arm mechanism 30 and the adjacent intermediate arm mechanism 40.

An upper end of the anti-flutter strap 42 may be attached to the first and second cover section 24, 26 using a variety of fastening techniques. One such suitable fastening technique is a rivet. A lower end of the anti-flutter strap 42 may be attached to the rail car 22. In certain instances where there are restrictions on how objects may be attached to the rail car 22, the lower end of the strap may be attached to the rivet line along the rail car 22.

The anti-flutter strap 42 may be fabricated from a variety of materials using the concepts of the invention. One such suitable material for fabricating the anti-flutter strap 42 is a nylon strap. In certain embodiments, the anti-flutter strap 42 may have sufficient strength to resist stretching in response to wind blowing under the first and second cover sections 24, 26.

To minimize the potential of damage to the rail car cover system 10 and to reduce the potential of the product in the rail car 22 from coming out of the rail car 22 and minimize the potential of environmental elements from contacting the product in the rail car 22, it is desirable for each of the first and second cover section 24, 26 to be in a closed configuration prior to moving the rail car 22.

To ensure that the first and second cover sections 24, 26 are in the closed position, the first and second cover sections 24, 26 may each include at least one cover position sensors 62. In certain embodiments, the first and second cover sections 24, 26 each include a cover sensor on each of the side edges. The cover sensors 62 may be positioned on the side edge opposite a point of attachment to the rail car 22.

The cover sensor 62 may include a base switch with a post 64 extending therefrom. Pivoting of the post with respect to the base switch 66 causes the base switch 66 to move between on and off configurations. A rail car engagement mechanism 68 may be provided on the rail car 22. When the first and second cover section 24, 26 are in the closed configuration, the post 64 engages the rail car engagement mechanism 68 and thereby causes the switch 66 to move to the closed configuration.

Alternatively or additionally, it is possible to include a position sensor on at least one of the hydraulic actuator. The position could determine the rotational position of the hydraulic actuator to determine when the first and second cover section 24, 26 are in the closed configuration.

In certain situations, it is not possible for the first and second cover sections 24, 26 to move to the closed configuration after the product is loaded into the rail car 22. For example, coal occupies a greater volume when initially placed into the rail car 22. In response to the vibrating motion caused by the movement of the rail car 22, the coal may compact, which causes the volume of the coal to decrease.

The uncompacted coal may extend above an upper surface of the rail car 22 to an extent such that the rail car cover system 10 engages the coal pile. The contact between the rail car cover system 10 and the top of the coal pile may prevent the first and second cover sections 24, 26 from moving to the closed configuration.

Forcing the first and second cover section 24, 26 to the closed position when the coal pile prevents the first and second cover sections 24, 26 from moving to the closed position could not only put large forces on the first and second cover sections 24, 26 but also on the hydraulic components that cause the first and second cover sections 24, 26 to move between the open and closed configurations.

To minimize the problems caused by such forces, the rail car cover system 10 may have a pressure sensor. When the pressure sensor senses that the force needed to move the first and second cover sections 24, 26 exceeds a selected value, the pressure sensor may cause the hydraulic system to turn off.

At a selected time later, the hydraulic system may be reinitiated to attempt to move the first and second cover sections 24, 26 to the closed configuration. This delay can provide the coal pile time to settle caused by vibrations from the movement of the train. In certain embodiments, the selected time is between 10 and 20 minutes. In other embodiments, the selected time is about 15 minutes.

If the pressure sensor still measures a pressure that is greater than the threshold pressure, the pressure sensor will cause the hydraulic system to turn off. This process may be repeated until the first and second cover sections 24, 26 are indicated to be in the closed configuration by the cover sensor. Alternatively, the process may be repeated for a specified number of times before the process will be terminated. In certain embodiments, the process may be repeated 10 times. Terminating the process could prevent depletion of the batteries.

As is discussed in more detail herein, the activities of the pressure sensor may be recorded in a memory device within the control panel. Recording the activities can be used to determine whether there are problems with the manner in which the coal is loaded in the rail car 22. For example, even though a desired weight of coal is placed into the rail car 22, the coal may not be evenly distributed along the length of the rail car 22.

The rail car cover system 10 may also include an indicator that indicates when the first and second cover sections 24, 26 are not in the closed configuration. In certain embodiments, the indicator is a light that is visible to persons who are proximate to the rail car 22 having the rail car cover system 10.

The light may be operable in a variety of modes to indicate the status of the rail car cover system 10. For example, the light may constantly illuminate green when the rail car cover system 10 is in the closed configuration. When the rail car cover system 10 is not in the closed configuration, the light may illuminate in a different color such as red or the light may flash.

The train speed should not pose an issue at a rotary tipper unloading facility and can be set to optimize the cover systems performance. In certain embodiments, the entire train could have every cover open at a rotary tipper site before the rail car tipping process is begun.

The covers expose a large surface to the wind and should only be opened or closed if wind conditions are light to moderate unless moving of the covers between the opened and closed positions is done in a sheltered location.

In regions where the wind is relatively high, it may be desirable to provide a barrier along at least one side of the train where it is desired to operate the rail car cover system 10. In one configuration, the barrier may be provided by a line of trees or other vegetation. In other configurations, the barrier may be a fabricated wall.

It is not necessary for the barrier to extend the entire length of the rail car cover system 10 that is desired to be operated. Additionally, it is not required that the barrier extend above a maximum height of the first and second cover sections 24, 26 when oriented in a generally vertical configuration when moving between the open configuration and the closed configuration. Rather, the barrier should provide sufficient reduction in wind force to enable the first and second cover sections 24, 26 to reliably move between the open and closed configurations.

With rotary tipper rail cars, the cover 10 must be opened before dumping the coal. In the open position, the cover 10 and hinge assemblies 30, 36 are substantially adjacent the top chord of the rail car. In this position, the rail car can be leaned up against the spill girder of the tipper mechanism, clamped down and rotated over to dump the coal without damaging any of the components of the cover system 10.

All of the weight of the rail car and the coal is compressing the hinge plates and the cover material under those plates. There will be no load transferred to the hinges or the hydraulic rotary actuators. This occurs because the hinge plates and covers are firmly clamped to the top chord before they are attached to the rail car.

With bottom dumping rail cars, the first and second cover sections 24, 26 could remain in the closed position during the unloading process. If coal is dumped faster than air can leak into the rail car 22, the first and second cover sections 24, 26 will flex downwardly until a gap forms in between them down the center of the rail car 22.

This gap allows a sufficient volume of air to enter the rail car 22 to fill the void and relieve the low pressure caused by the exiting coal without damaging either the rail car 22 or the rail car cover system 10. Thereafter, the first and second cover sections 24, 26 will return to their original position.

The hydraulic actuators 70 may be connected using a coupling mechanism such as a quick disconnect coupler that enables the hydraulic actuator 70 to be disconnected to permit manual operation of the first and second cover sections 24, 26. The rail car cover system 10 may also include locking mechanisms that retains the first and second cover sections 24, 26 in the open configuration and/or the closed configuration. Such locking mechanisms may play an important role if it is necessary to disconnect the hydraulic actuators 70.

While it is generally desired to only position the first and second cover sections 24, 26 in the open configuration for loading and/or unloading of the rail car 22, it is possible to position the first and second cover sections 24, 26 in the open configuration when moving the rail car 22 for larger distances because the first and second cover sections 24, 26 may be substantially parallel to sides of the rail car 22 when in the open configuration. As noted above, the hydraulic actuator 70 or the locking mechanisms could retain the first and second cover sections 24, 26 in the open configuration.

Other possible methods for actuating the first and second cover sections 24, 26 include vacuum suction cups that would lift part or all of the cover up and over from an onsite structure mounted apparatus. A helix shape spiral track could guide the leading edge of the covers up and over from the onsite structure mounted apparatus.

An electromagnet lifting device could lift the leading end are up and over from an onsite structure mounted apparatus. A vertical cam actuator at the hinge point could rotate the cover up and over from an onsite structure mounted apparatus.

In another embodiment of the invention, the rail car cover system 10 may include a cover that is formed in two sections. Similar to the embodiment discussed above, the first and second cover sections may be pivotally mounted to the rail car. Magnets 90 may be used to maintain the first and second cover sections 24, 26 in the closed configuration.

The first and second cover sections 24, 26 may be moved between the open and closed configurations using a second magnet having a power that is stronger than the magnets used to maintain the first and second cover sections 24, 26 in the closed configuration. The second magnets may be electromagnets that may be deactivated when not needed. The second magnets are positioned proximate the center of the rail car 22 and then activated. The second magnets may be moved to cause the first and second cover sections 24, 26 to move from the closed configuration to the open configuration.

In yet another configuration, an elevated surface is provided adjacent to the rail car 22. When an arm on the rail car 22 is urged upwards by the elevated surface, the mechanism to cause movement of the cover system 10 from the closed configuration to the open configuration is activated. During which time, the product may be placed in the rail car 22. Thereafter, when the elevated surface is discontinued, the cover system 10 may be caused to move from the open configuration to the closed configuration.

A variety of mechanisms may be used to cause the cover system 10 to move between the open and closed configurations, an example of which is a closed loop hydraulic system.

The control system may be housed in an enclosure that is mounted to the rail car 22. In certain configurations, the control system is mounted proximate the hydraulic pump and the solar panel, which are described in other portions of this patent application. The control system may be mounted to what is referred to as the A end of the rail car 22, which is to be distinguished from the B end of the rail car 22, where the brake is located.

The control system includes the circuitry needed for the operation of the rail car cover system. A person of skill in the art will appreciate that the control system may be implemented in a variety of manners using the concepts of the invention. One such control system is a PLC controller.

In addition to controlling the operation of the rail car cover system, the control system may also include a memory module that tracks aspects relating to the operation of the rail car cover system 10. For example, the memory may record the number of times that the rail car cover system 10 has moved between the opened and closed configurations. The memory can also record the status of the battery.

As discussed above, it is desirable to avoid flutter in the cover material 60, as the flutter could cause damage to the cover material 60 and the other components of the rail car cover system 10 if the flutter is permitted to continue. The flutter may be facilitated when the cover material 60 is not taut.

One such time in which the cover material 60 may not be taut is as the first and second cover sections 24, 26 are moving between the open and closed configurations. To maintain the tautness of the cover, one of the ends of each of the first and second cover section 24, 26 may be moved first to provide the first and second cover section 24, 26 with a partial spiral shape when moving between the open and closed configurations. In such a process, one end of each of the first and second cover section 24, 26 may be permitted to move before an opposite end of the first and second cover section 24, 26.

To ensure that the first cover section 24 and the second cover section 26 close in a desired order so that the end of the first cover section 24 on which the plates are mounted is beneath the end of the second cover section 26 on which the magnets 90 are mounted, the control system may be configured to cause the first cover section 24 to move completely from the open configuration before the second cover section 26 is moved from the open configuration to the closed configuration.

When using a hydraulic system to control the operation of the first and second cover sections 24, 26, the hydraulic actuator with the least resistance may move first. Because the hydraulic actuators proximate the control system end of the rail car 22 are closer to the hydraulic pump, these hydraulic actuators would likely move first.

It is important that rail car cover system 10 operate reliably because if the cover fails to open prior to the loading operation, it may not be possible to operate the entire train with the rail car 22 being filled, especially if the unfilled rail car 22 is proximate the front of the train. In these situations, the train would have to be moved out of the loading area so that the rail car 22 with the non-working cover to be removed from the train set or serviced.

In view of this situation, the control system may include a manual override that allows the rail car cover system to be manually operated in situations where the primary controller fails or is otherwise not operable. The manual override may include at least one button. Depressing the button causes the rail car cover system 10 to move between the open and close configurations.

For instances where there is a complete failure of the control system, the control system and/or the hydraulic pump may include a port such as a hex connection that allows the rail car cover system to be operated by attachment to an external power source. An example of one such external power source is a drill.

To further increase the reliability of the control system, the control system may be fabricated in a modular configuration that permits individual parts of the control system to be readily replaced if one of the components experiences a failure.

It may be desirable to insulate the components of the control system from vibrations that are generated by or transmitted through the rail car 22. The insulation may be provided by mounting the control system on cushions to eliminate or significantly reduce the vibrations from passing through to the control system.

The control system may be mounted within an enclosure. The enclosure may not only protect the components of the control system from damage by environmental aspects but also protect the control system against intentional damage or vandalism. The enclosure may include a locking mechanism that provides only selected persons with the ability to access the components within the enclosure.

In the preceding detailed description, reference is made to the accompanying drawings, which form a part hereof, and in which is shown by way of illustration specific embodiments in which the invention may be practiced. In this regard, directional terminology, such as “top,” “bottom,” “front,” “back,” “leading,” “trailing,” etc., is used with reference to the orientation of the Figure(s) being described. Because components of embodiments can be positioned in a number of different orientations, the directional terminology is used for purposes of illustration and is in no way limiting. It is to be understood that other embodiments may be utilized and structural or logical changes may be made without departing from the scope of the present invention. The preceding detailed description, therefore, is not to be taken in a limiting sense, and the scope of the present invention is defined by the appended claims.

It is contemplated that features disclosed in this application, as well as those described in the above applications incorporated by reference, can be mixed and matched to suit particular circumstances. Various other modifications and changes will be apparent to those of ordinary skill. 

1. A rail car cover system comprising: a rail car having an opening; a first cover section operably attached to the rail car, wherein the first cover section comprises a first closure mechanism; and a second cover section operably attached to the rail car, wherein the second cover section comprises a second closure mechanism, wherein the first cover section and the second cover section are both movable between a closed configuration and an open configuration, when in the closed configuration, the first closure mechanism engages the second closure mechanism to maintain the first cover section and the second cover section in the closed configuration.
 2. The rail car cover system of claim 1, wherein the first closure mechanism comprises a magnet and wherein the second closure mechanism comprises a metallic plate.
 3. The rail car cover system of claim 2, wherein magnet resists loss of magnetic strength when the magnet is subjected to elevate temperatures.
 4. The rail car cover system of claim 2, wherein the magnet is at least partially formed from neodymium.
 5. The rail car cover system of claim 1, wherein the second closure mechanism has a length that is at least twice as long as a length of the first closure mechanism.
 6. The rail car cover system of claim 1, wherein the first closure mechanism is mounted proximate a distal edge of the first cover section and wherein the second closure mechanism is mount proximate a distal edge of the second cover section.
 7. The rail car cover system of claim 1, wherein a force to separate the first closure mechanism from the second closure mechanism is greater when the first closure mechanism is moved in a first direction that is generally perpendicular to a surface of the second closure mechanism than when the first closure mechanism is moved in a second direction that is generally parallel to the surface of the second closure mechanism.
 8. The rail car cover system of claim 1, wherein the first closure mechanism is at least partially recessed in the first cover section and wherein the second closure mechanism is at least partially recessed in the second cover section.
 9. The rail car cover system of claim 1, wherein the first cover section comprises a pair of side edges and a distal edge that extends between the side edges, wherein a plurality of the first closure mechanisms are mounted on the first cover section proximate the distal edge thereof.
 10. The rail car cover system of claim 9, wherein a spacing between adjacent first closure mechanisms proximate the side edges is less than a spacing between adjacent first closure mechanisms intermediate the side edges.
 11. The rail car cover system of claim 1, wherein the first cover section further comprises at least one first intermediate arm assembly, wherein the second cover section further comprises at least one second intermediate arm assembly and wherein the at least one first arm assembly is more rigid than the at least one second intermediate arm assembly.
 12. The rail car cover system of claim 1, wherein the first cover section and the second cover section are pivotally mounted with respect to the rail car.
 13. A rail car cover system comprising: a rail car having an opening; a first cover section operably attached to the rail car for movement between a closed configuration and an open configuration; a first cover movement mechanism operably attached to the first cover section; and a first cover position sensing mechanism operably connected to the first cover movement mechanism to turn off the first cover movement mechanism when the first cover section is in at least one of the closed configuration and the open configuration.
 14. The rail car cover system of claim 13, wherein the first cover position sensing mechanism is mounted proximate a distal edge of the first cover section.
 15. The rail car cover system of claim 13, wherein the first cover section comprises a first cover material and a first corner hinge assembly pivotally attached to the rail car, wherein the first corner hinge assembly is operably attached to the first cover material and wherein the first cover position sensing mechanism is operably mounted to the first corner hinge assembly.
 16. The rail car cover system of claim 13, and further comprising a gusset attached to at least one of the rail car and the first corner hinge assembly, wherein the gusset limits a distance that the first corner hinge assembly is pivotable with respect to the rail car.
 17. The rail car cover system of claim 13, wherein the first cover position sensing mechanism comprises: a switch operably attached to the first cover section; and a switch activation mechanism operably attached to the rail car, wherein the switch engages the switch activation mechanism when the first cover section is in the closed configuration.
 18. A rail car cover system comprising: a rail car having an opening; a first cover section operably attached to the rail car for movement between a closed configuration and an open configuration; a first cover movement mechanism operably attached to the first cover section; a battery operably attached to the first cover movement mechanism; and a battery charging mechanism operably attached to the battery.
 19. The rail car cover system of claim 18, wherein the battery charging mechanism is a solar panel mounted to the rail car, a generator operably engaging at least one of a wheel that supports the rail car or a generator that engages a rail over which the rail car is movable.
 20. A rail car cover system comprising: a rail car having an opening; a first cover section comprising: a first cover material; a first corner hinge assembly pivotally attached to the rail car, wherein the first corner hinge assembly is operably attached to the first cover material; a first intermediate hinge assembly pivotally attached to the rail car, wherein the first intermediate hinge assembly is operably attached to the first cover material; and a first anti-flutter strap attached to the rail car and the first cover material intermediate the first corner hinge assembly and the first intermediate hinge assembly, wherein the first cover section is movable between a closed configuration and an open configuration, when in the closed configuration, the first cover section substantially covers the opening.
 21. The rail car cover system of claim 20, wherein the first anti-flutter strap is fabricated from a flexible material.
 22. The rail car cover system of claim 20, wherein the first anti-flutter strap substantially prevents a proximal edge of the first cover material from moving vertically with respect to the rail car.
 23. A method of covering a rail car comprising: providing a rail car having a hopper door proximate a lower end thereof and having an upwardly directed opening; pivotally attaching a first cover section to the rail car, wherein the first cover section comprises a first closure mechanism; pivotally attaching a second cover section to the rail car, wherein the second cover section comprises a second closure mechanism; pivoting the first cover section and the second cover section to an open configuration; placing a product into the rail car; and pivoting the first cover section and the second cover section to a closed configuration where the upwardly directed opening is substantially covered, wherein the first closure mechanism engages the second closure mechanism when in the closed configuration.
 24. The method of claim 23, and further comprising: discharging the product from the rail car through the hopper door; and deflecting at least one of the first cover section and the second cover section to a deflected position where the first closure mechanism does not engage the second closure mechanism.
 25. The method of claim 23, wherein a distal edge of the first cover section at least partially overlaps a distal edge of the second cover section when the first cover section and the second cover section are in the closed configuration.
 26. The method of claim 23, wherein the first closure mechanism comprises a magnet and wherein the second closure mechanism comprises a metallic plate.
 27. The method of claim 23, wherein a force to separate the first closure mechanism from the second closure mechanism is greater when the first closure mechanism is moved in a first direction that is generally perpendicular to a surface of the second closure mechanism than when the first closure mechanism is moved in a second direction that is generally parallel to the surface of the second closure mechanism.
 28. The method of claim 23, wherein the product has an initial height that is above an upper edge of the rail car, wherein at least one of the first cover section and the second cover section contact the product when the first cover section and the second cover section are in the closed configuration and wherein the first closure mechanism and the second closure mechanism in a first engaged position when the product is at the initial height.
 29. The method of claim 28, and further comprising: compacting the product to a compacted height that is less than the initial height; and moving the first closure mechanism with respect to the second closure mechanism so that the first closure mechanism and the second closure mechanism are in a second engaged position.
 30. The method of claim 29, wherein the first closure mechanism slides with respect to the second closure mechanism when moving between the first engaged position and the second engaged position.
 31. The method of claim 23, and further comprising mounting a plurality of the first closure mechanisms on the first cover section.
 32. The method of claim 31, wherein the first cover section has a pair of side edges, wherein a spacing between adjacent first closure mechanisms proximate the side edges is less than a spacing between adjacent first closure mechanisms intermediate the side edges.
 33. The method of claim 23, wherein the first cover section further comprises at least one first intermediate arm assembly, wherein the second cover section further comprises at least one second intermediate arm assembly and wherein the at least one first arm assembly is more rigid than the at least one second intermediate arm assembly.
 34. A method of covering a rail car comprising: providing a rail car having an opening; operably attaching a first cover section to the rail car; moving the first cover section between a closed configuration and an open configuration with a first cover movement mechanism; sensing a position of the first cover portion with a first cover position sensing mechanism; and turning off the first cover movement mechanism when the first cover section is in at least one of the closed configuration and the open configuration.
 35. The method of claim 34, wherein the first cover position sensing mechanism is mounted proximate a distal edge of the first cover section.
 36. The method of claim 34, wherein the first cover position sensing mechanism comprises a switch and a switch activation mechanism, wherein the switch is operably attached to the first cover section, wherein the switch activation mechanism is operably attached to the rail car and wherein the switch engages the switch activation mechanism when the first cover section is in at least one of the closed configuration and the open configuration.
 37. The method of claim 34, wherein the first cover section comprises a first corner hinge assembly and a first cover material that is attached to the first corner hinge assembly, wherein the first cover sensing mechanism is operably attached to the first corner hinge assembly, and wherein the first corner hinge assembly is positionable in the closed configuration when product is placed in the rail car and the first cover material contacts at least a portion of the product that is above an upper edge of the rail car. 